Pushing the device emulation from the hypervisor to user space has some distinct advantages. The most important advantage relates to what's called the trusted computing base (TCB).
将设备模拟从管理程序推向用户空间有一些明显的优势，最大的优势涉及所谓的可信计算基础(trusted computing base, TCB)。
Trusted Computing Base is an install-time option only and to enable TCB on an existing AIX machine, you need to reinstall the entire AIX operating system.
可信计算基础只是一个安装时选项，并且若要在现有的AIX计算机上启用TCB，您需要重新安装整个AIX操作系统。
Trusted Computing Base (TCB) is the security feature available with IBM AIX versions later than version 4.1.
可信计算基础（Trusted Computing Base，TCB）是 4.1 版以后的 IBM AIX 版本提供的安全功能。
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